negative pressure relief valve

negative pressure relief valve

negative pressure relief valveclick for a larger image
The cabin-air pressure safety valve combines functions of over-pressure relief valve, vacuum relief valve, and dump valve. Over-pressure relief valve prevents cabin pressure from exceeding specified values; vacuum relief ensures that ambient air pressure is less than cabin pressure by allowing ambient air to enter cabin whenever ambient air exceeds cabin pressure; while dump valve permits depressurization of cabin by cockpit operated switch.
A relief valve in an aircraft pressurization system that prevents the pressure in the cabin from becoming lower than the ambient outside pressure.
References in periodicals archive ?
The pressure control equipment consists of a negative pressure relief valve, which allows for pressure equalization between the vehicle interior and the outside air during reentry in the event the cabin pressure has leakage.
dagger] Steady state of negative pressure once the water column negative pressure relief valve has vented itself it continues to vent by bubbling at steady rate.
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